Page 72 - Science Course 3 (Book 1)

Mo2-L4a: How Do Organisms in an Ecosystem Interact?

Commensalism Key Concept
a symbiotic relationship that benefits one species How Do Organisms in an Ecosystem Interact?
but does not harm or benefit the other.
How does a niche differ form a habitat?

Parasitism
a symbiotic relationship in which one organism
benefits and the other is harmed.

Let’s Begin

Niches Competition
A habitat is area within an ecosystem that provides Competition describes the demand for resources,
an organism with the resources it needs for life. such as food, water, and shelter, in short supply in a
community.
A niche is the way a species interacts with abiotic
and biotic factors to obtain food, find shelter, and Competition can take place among the members of
fulfill other needs. a population or between two populations of different
species.
Species share habitats, but no two species share the
same niche Competition limits population size.

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